Fun fact: they actually covered that in an episode of the Real Ghostbusters, when some other inventor ripped off the Ghostbusters' Proton Pack tech to put on a "Robo-Buster" device, only set to dissolve the ghosts rather then catch them.

That ended up dispersing the ghosts' energies, which re-accumulated into a massive super-ghost that the Team had to capture. So Kudos to this writing team for referring to that concept.

I just saw the whole movie as "desperate times call for desperate solutions" personally. They were pretty much never in a situation where they could have trapped ghosts, except for the one that they did. With the early ghosts they were still figuring out their equipment and the later ghosts were way too numerous to catch them all.

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